ASP.NET Core Middleware & Pipeline 3

Question 1

What is the difference between app.Use() and app.Run() middleware registration?

Accepted Answer

Use() can call next middleware; Run() is terminal and cannot

Answer

app.Use() receives next delegate and can pass control forward, while app.Run() is a terminal middleware with no next.

Question 2

Which middleware enables Cross-Origin Resource Sharing in ASP.NET Core?

Accepted Answer

UseCors()

Answer

UseCors() applies CORS policies to responses, and must be called before UseRouting or after UseRouting per policy.

Question 3

What class is used to write custom convention-based middleware in ASP.NET Core?

Accepted Answer

A plain class with an Invoke or InvokeAsync method

Answer

ASP.NET Core discovers convention-based middleware as any class with a public Invoke or InvokeAsync method taking HttpContext.

Question 4

In which environment is UseDeveloperExceptionPage() typically called?

Accepted Answer

Development

Answer

UseDeveloperExceptionPage() shows detailed error info and should only be used in Development to avoid leaking sensitive data.

Question 5

What does the RequestDelegate type represent in ASP.NET Core middleware?

Accepted Answer

A function that processes an HTTP request

Answer

RequestDelegate is defined as Func<HttpContext, Task> and represents an async function that handles an HTTP request.

ASP.NET Core Practice Test